The new titles for Prince Harry's children are thanks to rules set out by King George V in 1917.
Technically, as Archie and Lili are now the children of a son of a sovereign, the two little ones can now use the titles of prince and princess.
However, according to the royal website, Archie and Lilibet are respectively listed as 'master' and 'miss'.
A spokesman for the Palace told the Express that the titles will be updated on the website 'as and when we get information'.
It has not been confirmed yet by their parents or Buckingham Palace whether the children will use the titles, although they now are technically a prince and princess.
William and Kate's titles have already changed.
The duo have become the new Prince and Princess of Wales, a role previously held by then-Prince Charles and Princess Diana.
The King has expressed his love for Harry, Meghan, and their children, with a palace spokesperson highlighting to the Express that all titles will be updated as they are announced.
"While the website was updated for the Waleses, clearly updating love on a website doesn't quite work so we've not quite done that but clearly he does love them," the King's spokesman said.
He added: "We will be working through updating the website as and when we get information."
The spokesman was also asked if Archie and Lili will in fact take up the titles of prince and princess.
"At the moment, we're focused on the next 10 days and as and when we get information, we will update that website," the King's spokesman said, as per the Express.
In 2021, it was suggested Charles - in a bid to limit the number of key royals - intended, when he became monarch, to prevent Archie from becoming a prince.
King Charles said last May that when he ascended the throne he intended to have a ' 'slimmed down' monarchy which hints that he may move to change key legal documents and therefore prevent Archie and Lilibet from receiving their Prince and Princess titles.
Prince Harry and Meghan Markle do have the choice to accept or reject the titles for their children if they are offered.Featured Image Credit: Sipa US/Alamy Stock Photo. Twitter/@misanharriman.